Selecting macroblock coding modes for video encoding

a coding mode and macroblock technology, applied in the field of video coding, can solve the problem of very intensive computation of the rate-distortion optimized coding mode decision

Inactive Publication Date: 2005-12-15
MITSUBISHI ELECTRIC RES LAB INC
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Benefits of technology

[0026] A rate required to code the quantized difference is determined. A distortion is determined according to the difference and the reconstructed difference. Then, a cost is determ

Problems solved by technology

Therefore, the computation of the rate-distortion

Method used

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  • Selecting macroblock coding modes for video encoding
  • Selecting macroblock coding modes for video encoding
  • Selecting macroblock coding modes for video encoding

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Embodiment Construction

[0030] Our invention provides a method for determining a Lagrange cost, which leads to an efficient, rate-distortion optimized macroblock mode decision.

[0031] Method and System Overview

[0032]FIG. 3 shows the method and system 300, according to the invention, for selecting an optimal coding mode from multiple available candidate coding modes for each macroblock in a video. The selection is based on a Lagrange cost for a coding mode of a macroblock partition.

[0033] Both an input macroblock partition 101 and a predicted 312 macroblock partition prediction 322 are subject to HT-transforms 311 and 313, respectively. Each transform produces respective input 301 and predicted 302 HT-coefficients. Then, a difference 303 between the input HT-coefficient 301 and predicted HT-coefficient 302 is determined 314. The difference 303 is quantized 315 to produce a quantized difference 304 from which a coding rate R 306 is determined 317.

[0034] The quantized difference HT-coefficients are also su...

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Abstract

A method selects an optimal coding mode for each macroblock in a video. Each macroblock can be coded according a number of candidate coding modes. A difference between an input macroblock and a predicted macroblock is determined in a transform-domain. The difference is quantized to yield a quantized difference. An inverse quantization is performed on the quantized difference to yield a reconstructed difference. A rate required to code the quantized difference is determined. A distortion is determined according to the difference and the reconstructed difference. Then, a cost is determined for each candidate mode based on the rate and the distortion, and the candidate coding mode that yields a minimum cost is selected as the optimal coding mode for the macroblock.

Description

RELATED APPLICATION [0001] This application is related to U.S. patent application Ser. No. ______, “Transcoding Videos Based on Different Transformation Kernels” co-filed herewith by Xin et al., on Jun. 1, 2004, and incorporated herein by reference.FIELD OF THE INVENTION [0002] The invention relates generally to video coding and more particularly to selecting macroblock coding modes for video encoding. BACKGROUND OF THE INVENTION [0003] International video coding standards, including MPEG-1, MPEG-2, MPEG-4, H.261, H.263 and H.264 / AVC, are all based on a basic hybrid coding framework that uses motion compensated prediction to remove temporal correlations and transforms to remove spatial correlations. [0004] MPEG-2 is a video coding standard developed by the Motion Picture Expert Group (MPEG) of ISO / IEC. It is currently the most widely used video coding standard. Its applications include digital television broadcasting, direct satellite broadcasting, DVD, video surveillance, etc. The ...

Claims

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Application Information

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IPC IPC(8): H04N7/32G06K9/36G06K9/46H04N7/26
CPCH04N19/176H04N19/147H04N19/40H04N19/19H04N19/122
Inventor XIN, JUNVETRO, ANTHONYSUN, HUIFANG
Owner MITSUBISHI ELECTRIC RES LAB INC
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